37mm size for law enforcement agencies. The 40mm model has a rifling of 1:1.224, is 900mm long, and weighs 4.4 kg (9.5 lb). The muzzle velocity is 74.7 m/s (M-406 grenade). Its range for precision fire, at a single target, is 150 meters; and for area coverage, with fragmentation munitions, is 350 meters. Assault Pistol Rifle The Assault Pistol Rifle (APR) mounts a custom pistol in the front part of the weapon to allow the use of rifle cartridges. It fires 5.56 mm ammunition. The APR pistol can be removed from the CornerShot frame. Description In the standard version a pistol is mounted in the front end of the weapon, which bends horizontally at a mid-frame sixty-degree hinge. There is a digital camera and a flashlight attached to the barrel in the bayonet position. On the butt side of the hinge are the trigger, camera screen (which is on a horizontal hinge just like the mid-gun hinge but it is off of the left side of the gun), and controls for the camera and light. Similar weapons The periscope rifle was independently developed by a number of individuals as a response to the trench warfare of World War I; they were used by armies of several countries from 1914 onwards. This earlier idea was simply a specialised "second" stock and trigger mechanism combined with a periscope to allow the shooter to remain safely within the trench and still aim and fire a rifle that was laid over the top of the trench parapet. The Krummlauf (curved barrel) was an attachment for the Sturmgewehr 44 rifle, which was used by the Germans in World War II. It allowed the shooter to aim and fire around corners with its bent barrel and a periscope-style sight. A disadvantage of the device was its short life, due to the stress of firing. China China has made at least three CornerShot-like weapons to date: the HD-66, which is based on the CornerShot, and the CF-06. Both models were first unveiled at the 4th China Police Expo (CIPATE) and developed by the Chongqing Changfeng Machinery Co Ltd and Shanghai Sea Shield Technologies Company. According to Qing Shanseng, chief designer of the HD-66 and CF-06, both systems are indigenous and were not done based on the CornerShot. The third one, known as the CS/LW9, was developed by the China Ordnance Industry Research Institute in 2005 in an